Research Article| October 01, 2010 Astronomical tuning of the Aptian Stage from Italian reference sections Chunju Huang; Chunju Huang 1Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland 21218, USA Search for other works by this author on: GSW Google Scholar Linda Hinnov; Linda Hinnov 1Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland 21218, USA Search for other works by this author on: GSW Google Scholar Alfred G. Fischer; Alfred G. Fischer 2Department of Earth Sciences, University of Southern California, Los Angeles, California 90089, USA Search for other works by this author on: GSW Google Scholar Alessandro Grippo; Alessandro Grippo 3Department of Earth Science, Santa Monica College, Santa Monica, California 90405, USA Search for other works by this author on: GSW Google Scholar Timothy Herbert Timothy Herbert 4Department of Geological Sciences, Brown University, Providence, Rhode Island 02912, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Chunju Huang 1Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland 21218, USA Linda Hinnov 1Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland 21218, USA Alfred G. Fischer 2Department of Earth Sciences, University of Southern California, Los Angeles, California 90089, USA Alessandro Grippo 3Department of Earth Science, Santa Monica College, Santa Monica, California 90405, USA Timothy Herbert 4Department of Geological Sciences, Brown University, Providence, Rhode Island 02912, USA Publisher: Geological Society of America First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2010 Geological Society of America Geology (2010) 38 (10): 899–902. https://doi.org/10.1130/G31177.1 Article history First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Chunju Huang, Linda Hinnov, Alfred G. Fischer, Alessandro Grippo, Timothy Herbert; Astronomical tuning of the Aptian Stage from Italian reference sections. Geology 2010;; 38 (10): 899–902. doi: https://doi.org/10.1130/G31177.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract A high-resolution grayscale series of the pelagic Fucoid Marls (Piobbico core, central Italy) shows strong, pervasive lithological rhythms throughout the Aptian interval. A hierarchy of centimeter- to meter-scale cycles characterizes the rhythms; when calibrating ∼1 m cycles to Earth's 405 k.y. orbital eccentricity cycle, these rhythms correspond to the periods of the eccentricity, obliquity, and precession index. Tuning to orbital eccentricity cycles provides a high-resolution time scale for the Aptian. Correlation to the Cismon core (northern Italy) extends the tuning to the Aptian-Barremian boundary. The tuning indicates a minimum duration of 13.42 m.y. for the Aptian Stage, where previous estimates range from 6.4 to 13.8 m.y. The combined Aptian–Albian astronomical tuning of the entire 77-m-long Piobbico core (and part of the Cismon core) provides a 25.85-m.y.-long astronomically calibrated time scale for Earth history. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.